Name

ST_SetSRID — Set the SRID on a geometry to a particular integer
value.

Synopsis

geometry ST_SetSRID(geometry
geom, integer
srid);

Description

Sets the SRID on a geometry to a particular integer value.
Useful in constructing bounding boxes for queries.

This function does not transform the geometry coordinates in any way -
it simply sets the meta data defining the spatial reference system the geometry is assumed to be in.
Use ST_Transform if you want to transform the
geometry into a new projection.